Document gcloud commands for adding IAM roles
Document gcloud commands for adding IAM roles

These commands serve as an alternative method of adding the correct
IAM roles to service accounts, without having to go through the Google
Cloud Platform console.

PiperOrigin-RevId: 402624031
Change-Id: I39705ba6b1ff88e4c652ecffb11c0a3401da7bd5

GoogleCloudPlatform/stet